*{
    margin:0;
    padding: 0;
    box-sizing: border-box;
}
.Logo{
    position: fixed;
    width: 210px;
    height: 70px;
    background: url("./Photo/Logo.png");
    background-size:100% 100%;
    right:0 ;
    top: 0;
}
ul{
     list-style: none;
 }
body{
    width: 100%;
    height: 3600px;
  }
a{
    text-decoration: none;
}
div{
    display: block;
}
.INDEX{
    width: 100%;
    height: 1300px;
}
#Main_Left{
    position: fixed;
    left: 0;
    top: 0;
    width: 240px;
    height: 1300px;
}
#Side{
    height: 100%;
    background-color: white;
    box-shadow: 0 0 20px hsl(0, 0%, 76%);
}
#Login{
    cursor: pointer;
    height: 160px;
    padding: 20px 0 20px 80px
}
#List{
    height: 600px;
}
#List .List_BLock{
    color: #a8a8a8;
}
#List .List_BLock:hover{
    color: #2f9aff;
}
.Chosed{
     color: #2f9aff;
     background-color: #ebf5ff;
 }
#Login img{
    width: 60px;
    height: 60px;
    margin-bottom: 5px;
}
#Main_Left .List_BLock{
    height: 50px;
    line-height: 50px;
    padding-left: 80px;
}
#Main_Right{
    position: relative;
    margin-left: 240px;
    float:left;
    width: 1255px;
    height: 1300px;
}
#bx{
    margin: 0 auto;
    width: 860px;
    height: 100%;
}
#Search{
    width: 860px;
    height: 80px;
    border-bottom:  solid lightgray 1px;
    box-shadow: 0 2px 4px #00000014;
    line-height: 80px;
}
#lbt{
    margin-top:10px ;
    width: 860px;
    height: 375px;
    border-radius: 30px;
    background:url('./Photo/LB1.jpg');
}
.Section{
    width: 860px;
    height: 500px;
    margin-top:20px;
}
.Title{
    width: 860px;
    height: 55px;
    font-size: 35px;
    margin-bottom: 30px;
    margin-top: 10px;
}
.Books{
    padding-left:10px ;
    padding-top: 20px;
    width: 860px;
    height: 350px;
}
.Books a{
    color: white;
    font-size: 22px
}
.BookContent:hover{
    background: rgba(54, 54, 54, 0.3);
}
.book{
    float: left;
    margin-top: 30px;
    margin-left: 25px;
    width: 250px;
    height: 120px;
    border-radius: 5px;
    background: url("./Photo/Book2.jpg");
    background-size:100% 100%
}
.BookContent{
    padding-top: 20px;
    padding-left: 10px;
    height: 100%;
    width: 100%;
}

.Wri{
    font-size: 15px;
}
.Love{
    position: relative;
    top: 20px;
    left: 200px;
}
#l-go{
    display: block;
    float: left;
    margin-top: 160px;
    margin-left: 20px;
    width: 40px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    color: white;
    background: rgba(212, 212, 212, 0.5);
    border-radius: 50%;
}
#l-go:hover{
    background: rgba(83, 83, 83, 0.7);
}
#r-go{
    display: block;
    float: right;
    margin-top: 170px;
    margin-right: 20px;
    width: 40px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    color: white;
    background: rgba(212, 212, 212, 0.5);
    border-radius: 50%;
}
#r-go:hover{
    background: rgba(83, 83, 83, 0.7);
}
#Search li{
    float: left;
    margin-right: 50px;
}
#Search li a{
    color: black;
    display: block;
    height: 70px;
    line-height: 85px;
    padding: 0 10px;
    font-size: 16px;
}
#Search li a:hover{
    color:white;
    background-color: red;
}
#Input{
    margin-left: 20px;
    float: right;
    height: 60px;
    position: relative;
}
#input-box{
    width: 50px;
    height: 50px;
    border: 0;
    border-radius: 20px;
    transition: width 0.5s ease;
}
#input-box:focus{
    outline: none;
}
#btn{
    background: #e3e3e3;
    border: 0;
    border-radius: 20px;
    cursor: pointer;
    position: absolute;
    top: 20px;
    left: 0;
    height: 45px;
    width: 50px;
    transition: transform 0.5s ease;
}
.Git  #input-box{
    padding-left: 10px;
    background: #e3e3e3;
    width: 300px;
    border: 1px solid #cdcdcd;
}
.Git #btn{
    background: #c2c2c2;
    transform: translateX(247px);
}
#Bg{
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    background: rgba(0,0,0,0.4);
    z-index: 9998;
    display: none;
}
#Bg2{
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    background: rgba(0,0,0,0.4);
    z-index: 9998;
    display: none;
}
#Enroll{
    width: 400px;
    height: 400px;
    border-radius: 25px;
    text-align: center;
    padding-top: 20px;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: 9999;
    background: rgba(255, 255, 255, 1);
    display: none;
    box-shadow: 0 1px 3px rgba(0,0,0,.3);
}
#Enroll2{
    width: 400px;
    height: 400px;
    border-radius: 25px;
    text-align: center;
    padding-top: 20px;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: 9999;
    background: rgba(255, 255, 255, 1);
    display: none;
    box-shadow: 0 1px 3px rgba(0,0,0,.3);
}
#En-title{
    height: 45px;
    line-height: 30px;
    text-align: center;
    border-bottom: 1px solid #DCDCDC;
    position: relative;
}
.Content input{
    height: 48px;
    width: 80%;
    margin: 20px auto;
    border: 0;
    border-bottom: 1px solid silver;
    outline: none;
    font-size: 22px;
    font-weight: lighter;
}
.Content button{
    background: #409eff;
    color: white;
    margin-top: 20px;
    border: 0;
    border-radius: 10px;
    cursor: pointer;
    height: 45px;
    width: 80%;
    font-size: medium;
}
.Content button:hover{
    background: #54a9ff;
}
#En-title a{
    display: block;
    position: fixed;
    top: 8px;
    right: 18px;
    z-index: 9999;
}